<p>Even when a lead wire plated with lead-free tin and available from a wire manufacturer is directly used as a tab terminal, it is possible to obtain a tab terminal in which tin whisker is not generated from a welded part and which exhibits good solder wettability. Its producing process is also disclosed. The tab terminal for an electrolytic capacitor is obtained by welding an aluminium core having a flat press part to the end part of a lead wire having a metal layer of tin formed on the surface of the core. The surface at the welded part between the lead wire part and the aluminium core is subjected to a treatment for suppressing growth of whisker.</p>
